70 scamp. what wires out of ignition switch start the car?
Wiring diagrams such as they are
The main feed to the ignition switch is either a big fat red or black, check with your light
brown is "ignition 2" meaning it bypasses the resistor in start
dark blu is "ignition 1" meaning "ignition in run"
yellow is the "crank" that operates the firewall start relay. Don't forget---clutch safety switch? neutral safety switch?
http://www.mymopar.com/downloads/1970/70DartA.JPG
http://www.mymopar.com/downloads/1970/70DartB.JPG
It's probably easier to do under the hood. You can jumper the firewall relay to operate the starter, and clip power to the coil resistor for ignition
What do you have, xactly, fer ignition? Stock points, Mopar ECU, Pertronix, etc?